linux-kernel - Re: [PATCH] HID: logitech-hidpp: rework one more time the retries attempts

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Message-ID: <CAO-hwJLc0wzv2a3JARkPDW+ZgbnvwggfRHcAJmWsKy_FMA13=g@mail.gmail.com>
Date:   Tue, 11 Jul 2023 15:40:51 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Bastien Nocera <hadess@...ess.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Filipe Laíns <lains@...eup.net>,
        Jiri Kosina <jikos@...nel.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] HID: logitech-hidpp: rework one more time the retries attempts

On Tue, Jul 11, 2023 at 3:10 PM Linux regression tracking (Thorsten
Leemhuis) <regressions@...mhuis.info> wrote:
>
> On 26.06.23 16:02, Benjamin Tissoires wrote:
> > On Sun, Jun 25, 2023 at 10:30 AM Bastien Nocera <hadess@...ess.net> wrote:
> >> On Fri, 2023-06-23 at 10:37 +0200, Benjamin Tissoires wrote:
> >>> On Jun 21 2023, Greg KH wrote:
> >>>> On Wed, Jun 21, 2023 at 11:42:30AM +0200, Benjamin Tissoires wrote:
> >>>>> Make the code looks less like Pascal.
> >>>>>
> >>>>> Extract the internal code inside a helper function, fix the
> >>>>> initialization of the parameters used in the helper function
> >>>>> (`hidpp->answer_available` was not reset and `*response` wasn't
> >>>>> too),
> >>>>> and use a `do {...} while();` loop.
> >>>>>
> >>>>> Fixes: 586e8fede795 ("HID: logitech-hidpp: Retry commands when
> >>>>> device is busy")
> >>>>> Cc: stable@...r.kernel.org
> >>>>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> >>>>> ---
> >>>>> as requested by
> >>>>> https://lore.kernel.org/all/CAHk-=wiMbF38KCNhPFiargenpSBoecSXTLQACKS2UMyo_Vu2ww@mail.gmail.com/
> >>>>> This is a rewrite of that particular piece of code.
> >>>>> ---
> >>>>>  drivers/hid/hid-logitech-hidpp.c | 102 +++++++++++++++++++++++--
> >>>>> --------------
> >>>>>  1 file changed, 61 insertions(+), 41 deletions(-)
> > [...]
> >
> > Some people on the Bz were able to reproduce with multiple reboots.
> > But it's not as urgent as previously, and we were close to the 6.4
> > final when I sent it. I'll make sure this goes into 6.5 and gets
> > proper stable backports FWIW.
>
> Did that happen? Doesn't look like it from here, but maybe I'm missing
> something. Where there maybe other changes to resolve the remaining
> problems some users encounter sporadically since the urgent fixes went in?

No, there were no other changes that could have solved this. I guess
the randomness of the problem makes it way harder to detect and to
reproduce.

I'll send a v2 of that patch with the reviews today or tomorrow and we
can probably get it through the current 6.5 cycle.

Cheers,
Benjamin

>
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
>